Urban areas subject to cultural heritage protection regulations often have different bottlenecks in the infrastructure which can be hardly addressed by regular infrastructure reinforcement interventions. Thus smart and non-invasive integrated management of buildings and grids introduced through the project Smart Building – Smart Grid – Smart City (acronym: 3Smart) presents a significant potential for surpassing the infrastructure bottlenecks and improvement of energy performance in these areas while leaving them visually intact. The potential of the project is recognized by the Croatian Association of Historical Cities – HUPG by giving us honour to present our work on an international conference “Sharing the Future of Cultural Heritage – Synergies between Heritage, Tourism and Digital Culture” on cultural heritage issues held in Dubrovnik from the 10th – 11th of April 2018.